Band Hero for Wii (game only) is $1.99 used at Microcenter. The game is only available in store, and it appears to be in stock at a few locations - Chicago, Columbus, and Dallas.
http://www.microcenter.com/single_product_results.phtml?product_id=0343838
http://www.microcenter.com/single_product_results.phtml?product_id=0343838